雨课堂学堂在线学堂云《Sensor Application Technology（日照职业技术学院）》单元测试考核答案

第1题x1,x2...xnarethemeasuredvalues,indicatewhichofthefollowingequationsrepresentstheresidual().Avi=xi-TruevalueBvi=xi-arithmeticmeanCvi=xi-indicationvalueDvi=xi-nominalvalue第2题Foralinearinstrument,itslinearityis().AlinearrelationshipwithoutputquantityBlinearrelationshipwithinputquantityCaconstantthatisnotequaltozeroDequaltozero第3题Thetemperatureofthetestedobjectisaround300℃.Thereareseveralspecificationsofthermometersavailableinthelaboratory,choosingoneofthemreasonablyfromtheperspectiveofimprovingmeasurementaccuracy.Arange800℃,accuracylevel1Brange400℃,accuracylevel1.5Crange600℃,accuracylevel1.5Drange500℃,accuracylevel2.5第4题Whichisthedynamiccharacteristicindexofsensors()?ArepeatabilityBlinearityCsensitivityDnaturalfrequency第5题Nonlineardegreereferstothedegreeofcalibrationcurve().AneartotruevalueBerrorfromfittingstraightlineCrouteofforwardandreversedirectionisnoncoincidenceDrepeatability第6题()referstothepartofthesensorthatcandirectlysensethebeingmeasured.AsensingcomponentBsensitivecomponentCmeasurementconversioncircuitDsensor第7题Arduinocanperceivetheenvironmentthroughvarioussensorsandgivefeedbackandimpactonenvironmentbycontrollinglights,motorsandotherdevices.ThemicrocontrollerontheboardcanprogrammebyusingArduinoprogramminglanguage,compileinto(),anddownloadintothemicrocontroller.AtxtfileBbinaryfileCJSscriptDhtmlWebpage第8题CH340isaUSBbustransferchipthatimplements()function.Thechipisintegratedonthedevelopmentboardmotherboard,thatistheUSBDebuginterface.BeforeusingtheUSBDebuginterface,itsdriverprogramneedstobeinstalledonthecomputer.AserialporttoUSBconversionBparallelporttoUSBconversionCUSBtoserialportconversionDUSBtoparallelportconversion第9题Thesmartcameraworks24hoursadayandgeneratesalargenumberofrecordedimagesthatneedtobestoredforeasyviewingbyusers.Thestoragemethodthatthesmartcamerascanadoptis().ASDcardlocalstorageBcloudstorageChybridstorageDalloftheabovearepossible第10题()referstotheratioofthesensoroutputincrement△ytothemeasuredincrement△xwhenthesensorisinsteady-stateoperation.ASensitivityBresolutionClinearityDhysteresis第11题Intheparametersofnaturalgasalarm,thesensorlifeusuallyreferstothe()ofthesensor.AServicelifeBbatterylifeCcalibrationcycleDmanufacturingtime第12题Automaticcontroltechnology,communicationtechnology,alongwithcomputertechnologyand(),constitutethecompleteinformationchainofinformationtechnology.AAutomotivemanufacturingtechnologyBbuildingtechnologyCsensingtechnologyDmonitoringtechnology第13题Sensorscanbedividedintothreecategoriesbasedonthesensitiveworkingprinciples:physical,chemical,and().AbiotypeBelectronictypeCthinfilmtypeDmaterialtype第14题Withthecontinuousimprovementofpeople'srequirementsforthetechnologicalcontentofvariousproducts,sensorsarealsodevelopingtowardsintelligence.Amongthem,thetypicalintelligentstructuralmodeofsensorsis().AsensorpluscommunicationstechnologyBsensorplusmicroprocessorCsensorplusmultimediatechnologyDsensorpluscomputer第15题Inrecentyears,researchonbiomimeticsensorshasbecomeincreasinglypopular,thiskindofsensormainlyimitatesthe()ofhumanbeing.AvisualorgansBauditoryorgansColfactoryorgansDsensoryorgans第16题Ifthecomputeriscomparedtoanadult’sbrain,thenthesensorcanbecomparedtobe().AeyesBsensoryorgansChandDskin第17题Thesensormainlyimplementstworespects’functions:detectionand().AmeasurementBperceptionCsignaladjustmentDconversion第18题Closelylinkedtoinformationdiscipline,sensingtechnologyisageneraltermfor()andautomaticconversiontechnology.AautomaticadjustmentBautomaticmeasurementCautomaticdetectionDinformationacquisition第19题Amongthefollowingsensors,whichisnamedbyworkingprinciple?()AstraingaugesensorBchemicalsensorCvelocitysensorDenergycontrolsensor第20题Whattherepresentingwayscanbeusedformeasurementerror?ArelativeerrorBabsoluteerrorCfull-scaleerrorDdecibelerror正确答案：AB第21题Whattherepresentingwayscanbeusedforrelativeerror?AactualrelativeerrorBindicationrelativeerrorCfull-scalerelativeerrorDabsoluteerror正确答案：ABC第22题Duringoperation,sensormustabidebysomebasicphysicallaws,including().ALawofConservationofEnergyBLawofInductioninElectromagneticFieldsCOhm'sLawDHooke'sLaw正确答案：ABCD第23题Sofar,sensorandsensortechnology,automaticmeasurementtechnologyhavegainedextensiveapplications,amongthefollowingfields,whichfielddoapplythesensingtechnology?()AindustrialfieldBmarinedevelopmentfieldCaerospacetechnologyfieldDmedicaldiagnostictechnologyfield正确答案：ABCD第24题Amongthefollowing,whicharethesensorclassification?()AclassifiedbyinputquantityBclassifiedbyworkingprincipleCclassifiedbyoutputquantityDclassifiedbyenergyconversionrelationship正确答案：ABCD第25题Themainfunctionofsensingtechnologyare().AThesensingtechnologyisanimportantmeansofproductinspectionandqualitycontrolBThesensingtechnologyiswidelyusedinmonitoringthesafeandeconomicoperationofsystemsCThesensingtechnologyanddevicesareindispensablecomponentsofautomationsystemsDTheimprovementanddevelopmentofsensingtechnologyaredrivingtheprogressofmodernscienceandtechnology正确答案：ABCD第26题Theresearchcontentsofsensingtechnologymainlyinclude().AinformationacquisitionBinformationconversionCinformationprocessingDinformationtransmission正确答案：ABC第27题Thedevelopmenttrendofsensingtechnologyismainlyshowninthefollowingaspectsof().AimproveandenhancethetechnicalperformanceofsensorsBintegrationofsensorsCconductfundamentaltheoreticalresearchDintelligenceofsensor正确答案：ABCD第28题Sensingtechnologyisaninterdisciplinaryfieldthatintegratesphysics,chemistry,materials,devices,electronics,bioengineering,andothersubjects,involvingcomprehensivetechnologiessuchas().AsensordetectionprincipleBdevelopmentandapplicationofsensorsCsaleandafter-salesserviceofsensorsDsalesandafter-salesserviceofsensors正确答案：ABC第29题Whatarethethreetypesoferror?AabsoluteerrorBsystematicerrorCrandomerrorDgrosserror正确答案：BCD第30题Whatarethethreeevaluationmethodsformeasurementresults?AaccuracyBprecisionCprecisenessDcompleteness正确答案：ABC第31题Absolutehumiditymeansabsolutecontentorconcentrationordensityofwatervaporinaunitspace,whichisnormallyrepresentedbyAH.第32题Byusingabsoluteerrortoindicatemeasurementerror,measurementlevelcanbewellshownbyabsoluteerror.第33题Thesmallertheresolutionis,theweakerthesensor'sabilitytodetectnonelectricquantities..第34题Relativehumidityreferstothepercentageofvaporpressureinthemeasuredgasandthesaturatedwatervaporpressureofthegasatthesametemperature,generallyrepresentedbythesymbolRH.第35题Intelligentdoorlockcangenerateatemporarypasswordthatisvalidforashortperiodoftimetoopenthedoor,savingthetroubleofforgettingtobringthekey.Itcanalsodisplayincorrectenterpasswordbynon-usersandgeneratedalarmrecords,etc.第36题Intelligentcameracanremotelymonitorreal-timeupdatesathomeandautomaticallycapturethedynamicsofdoorsandwindows.ItalsocanbecontrolledthroughanAppandactivelycaptureimagesandvideos.第1题Thechargedensitygeneratedonthesurfaceofpiezoelectricquartzcrystalis（）。AproportionaltothecrystalareaBproportionaltothepressureactingonthecrystalCinverselyproportionaltothecrystalthicknessDproportionaltotheremainingpolarizationstrength第2题Therearevariousinitialresistancesforstraingauges,amongwhich()isthemostcommonlyused.A60ΩB120ΩC200ΩD240Ω第3题Thesignalprocessingofpiezoelectricsensorsincludeschargeamplifiersandvoltageamplifiers,andthemaindifferencebetweenthetwointermsofapplicationis().AimpedancetransformationcapabilityBwhethertoincludetheimpactofchangesincablelengthCoutputvoltageandinputvoltageDthreeexplanationsareallincorrect第4题Theconicaltubeoftherotorflowmetermustbe().Auppersmall,lowerbigBupperbig，lowersmallCupperandlowerisconsistentDthefirstthreearefine第5题Thedifferentialpressureflowmeterusesathrottlingdevicetogeneratepressuredrop,andtherelationshipbetweenflowandpressuredifferenceinthepipelineis().AthesquarerootofthepressuredifferenceisproportionalBthepressuredifferenceisproportionalCthepressuredifferenceisinverselyproportionalDtheaveragedifferentialpressureisproportional第6题Whenasolid-statevaristorissubjectedtostressinacertaindirection,itsresistancevaluechangessignificantly.Whatfactorshavecausedsignificantchanges.AresistivityBgeometricdimensionsCelectricchargeonthecrystalsurfaceDpolarizedcharge第7题Piezoelectricsensorsarecurrentlycommonlyusedformeasuring().AstaticforceorpressureBdynamicforceorpressureCspeedDvelocitydisplacement第8题Themainreasonsfortemperatureerrorofstraingaugesisthat().AtheresistancewirehasatemperaturecoefficientBthecoefficientoflinearexpansionofthetestpieceisthesameCresistancewirevarieswithstressdirectionDenvironmentaltemperaturechanges第9题Whenstraingaugesensorusingadjacentdoublearmbridgesfordetection，whichchoicecanachievehighsensitivityandsmallnonlineaerror？AbothbridgearmsshouldusehighresistanceworkingstraingaugesBbothbridgearmsshouldbeconnectedinserieswithtwoworkingstraingaugesCthetwobridgearmsshouldbeusedseparatelyworkingstraingaugeswithoppositestrainDthetwobridgearmsshouldbeusedseparatelyworkingstraingaugeswithsamestrain第10题Piezoelectricsensorscanbeequivalentto().AchargesourceorvoltagesourceBchargesourceorcurrentsourceCcurrentsourceorvoltagesourceDcapacitor第11题Byattachingresistancestraingaugesto(),sensorsformeasuringforce,displacement,acceleration,andotherparameterscanbemadeseparately.AqualityblockBconductorCelasticcomponentDmachinecomponents第12题Semiconductorstraingaugeshaveadvantages,suchas().AhighsensitivityBgoodtemperaturestabilityChighreliabilityDcomplexinterfacecircuit第13题ConnectresistorRandcapacitorCinseriesandthenparalleltotheRCabsorptioncircuitformedbythetwoendsoftherelayorpowerswitch，what'sthefunction?AsuppresscommonmodenoiseBsuppressdifferentialmodenoiseCovercomecrosstalkDeliminateelectricalsparkinterference第14题Theabsolutezerodegreeofpiezoelectricmaterialsisthetemperaturetransitionpointatwhichthe()disappears.ApiezoelectriceffectBinversepiezoelectriceffectCtransversepiezoelectriceffectDlongitudinalpiezoelectriceffect第15题Accordingtodifferentworkingbridgearms,electricbridgescanbedividedinto().AhalfbridgesinglearmBhalfbridgedualarmCfullbridgeinputDselectall第16题Whenanalternatingelectricfieldisappliedinthepolarizationdirectionofadielectric,itundergoesmechanicaldeformation.Whentheexternalelectricfieldisremoved,thedeformationofthedielectricdisappears,andthisphenomenoniscalled().AinversepiezoelectriceffectBpiezoelectriceffectCpositivepiezoelectriceffectDpiezoresistiveeffect第17题Whatkindofeffectistheworkingprincipleofresistancestraingaugesmainlybasedon?ApiezoelectriceffectBhalleffectCstraineffectDthermoelectriceffect第18题Thechangeinresistanceofsemiconductormaterialsismainlycausedbythechangein()ofsemiconductormaterials,whichistheworkingprincipleofpiezoresistivesensors.AlengthBresistivityCcrosssectionalareaDgeometricdimensions第19题Reduceoreliminatenonlinearerrors,()canbeused.AincreasethesupplyvoltageBincreasetheresistancevalueofthebridgearmCimprovethebridgearmratioDimprovevoltagesensitivity第20题TheconditionforbalancingaDCbridgeis().AtheratioofadjacentarmresistancesisequalBtheratiooftheresistancebetweenthetwoarmsisequaCtheratioofresistancebetweenadjacentarmsisnotequalDallresistorsareequal第21题TheconditionforbalancingaDCbridgeis().AtheproductoftheresistancevaluesofadjacentbridgearmsisequalBtherelativebridgearmresistanceratioisequalCtheproductoftheresistancevaluesoftherelativebridgearmsisequalDthesumofresistancevaluesofadjacentbridgearmsisequal第22题Whichthefollowingstatementsiscorrectforquartzcrystals?Aapplyingforcealongtheopticalaxisdirection，itdoesnotgeneratepiezoelectriceffect,nordoesitgeneratecharge.BApplyingforcealongtheopticalaxisdirection，itdoesnotproducepiezoelectriceffect,butitwillgeneratechargegeneration.CApplyingforcealongtheopticalaxisdirection,itwillgeneratepiezoelectriceffect,butnochargewillbegenerated.DApplyingforcealongtheopticalaxisdirection,itwillnotonlygeneratepiezoelectriceffectandbutalsogenerateelectriccharges.第23题Whatisthecorrectcomparisonbetweenthepiezoelectriceffectofquartzandpiezoelectricceramics.Athepiezoelectriceffectofpiezoelectricceramicsisbetterthanthatofquartzcrystals,andtheirstabilityisalsobetterthanthatofquartzcrystalsBthepiezoelectriceffectofpiezoelectricceramicsisbetterthanthatofquartzcrystals,buttheirstabilityisnotasgoodasquartzcrystals.Cthepiezoelectriceffectofquartzcrystalsisbetterthanthatofpiezoelectricceramics,buttheirstabilityisalsobetterthanthatofpiezoelectricceramics.Dthepiezoelectriceffectofquartzcrystalisbetterthanthatofpiezoelectricceramic,andtheirstabilityisnotasgoodaspiezoelectricceramic.第24题Whatisthecorrectstatementwhentwopiezoelectriccomponentsareconnectedinseriescomparedtoasinglepiezoelectriccomponent.Awhenconnectedinseries,theoutputvoltageremainsunchanged,andthechargequantityisthesameasthatconnectinginasinglepiezoelectriccomponent.Bwhenconnectedinseries,theoutputvoltageincreasesbyonetime,andthechargequantityisthesameasthatconnectedinasinglepiezoelectriccomponents.Cwhenconnectedinseries,thechargequantityincreasesbyonetime,andthecapacitanceremainsunchanged.Dwhenconnectedinseries,thechargequantityincreasesbyonetime,andthecapacitanceishalfofthatconnectinginasinglepiezoelectriccomponent.第25题Whichthefollowingsignalisapiezoelectricaccelerometersensorsuitableformeasuring?AsuitableformeasuringanyBsuitableformeasuringgradualchangesCsuitableformeasuringdirectcurrentDsuitableformeasuringdynamics第26题Theindicatedvaluesofvariousordinarypressuregaugesare(),alsoknownasgaugepressure,abbreviatedasGP.ArelativepressureBabsolutepressureCstandardairpressureDatmosphericpressure第27题Whatisthecompositionofresistancestraingauges?AsensitivegateBsubstrateCcoverlayerDleadwire正确答案：ABCD第28题Whatarethecompensationmethodsforresistancestraingauges?AcompensationblockcompensationmethodBcircuitcompensationmethodCbridgeroadselfcompensationmethodDtemperaturecompensationmethod正确答案：AC第29题Accordingtodifferentformingmethodsofsensitivegate,therearemainlythreetypesofpiezoresistivesensors:(),(),and().AbodytypeBthinfilmtypeCdiffusiontypeDtypeofobject正确答案：ABC第30题WhatarethecommonPressureUnit?AengineeringatmosphericpressureBstandardatmosphericpressureCagreedmillimetermercurycolumnDagreedmillimeterwatercolumn正确答案：ABCD第31题Piezoelectricmaterialscanbedividedintothreecategories:(),(),and().ApiezoelectriccrystalBpiezoelectricceramicsCpolymerpiezoelectricmaterialsDnewpiezoelectricmaterials正确答案：ABC第32题Piezoelectricsensorisatypical()typesensorbasedon()ofacertaindielectricmaterial.ApassiveBactiveCpiezoelectriceffectDpiezoresistiveeffect正确答案：AC第33题Thephenomenonofgeneratingchargesundertheactionofforcealongtheelectricaxisx-directioniscalled()piezoelectriceffect;Thephenomenonofgeneratingchargesundertheactionofforcealongthey-directionofthemechanicalaxisiscalledthe()piezoelectriceffect.AradialBlongitudinalCtransverseDtangential正确答案：BC第34题Whataretheconnectionformsofpiezoelectriccomponents?AseriesconnectionBparallelconnectionCinterconnectionDcoupling正确答案：AB第35题Themainfunctionofresistancestraingaugesinelectronicscalesistodetectpressureandconvertitintoresistancechanges.第36题Piezoelectricsensorisaforcesensitivesensor.第37题Accordingtothedifferentcharacteristicsofthebridgepowersupply,bridgecircuitscanbedividedintoACbridgeandDCbridgecircuits.第38题Quartzcrystalsexhibitpiezoelectriceffectsalongtheopticalaxis.第39题Therearemainlytwotypesofresistancestraingauges:metalstraingaugesandsemiconductorstraingauges.第40题Themainfunctionofresistancestraingaugesinelectronicscalesistodetectpressureandconvertitintoresistancevariation.第41题Thecommonlyusedmaterialsforthesensitivegateinresistancestraingaugesincludeconstantanandnickelchromiumalloys.第42题Resistancestraingaugesrequirestrictcalibrationbeforeusetoensuretheaccuracyofmeasurementdata.第43题Piezoelectricsensorscanbeusedforstaticmeasurementsaswellasdynamicmeasurements.第44题Duetothehighsensitivityofsemiconductormaterialstotemperature,theirtemperaturestabilityandlinearityaremuchworsethanthoseofmetalresistancestraingauges.Therefore,thetemperatureerrorofpiezoresistivesensorsisrelativelylarge,then,itisnecessaryforthetemperaturecompensation.Chaptertest第1题Therearemanystructuralformsofdifferentialtransformersensors,amongwhich()isthemostwidelyused.AvariablegaptypeBvariableareatypeCscrewtubetypeDvariablemediumtype第2题Thepowersupplyfortheexcitationcoilofthereflectiveeddycurrentsensoris().Adirect-currentBpowerfrequencyalternatingcurrentChighfrequencyalternatingcurrentDlowfrequencyalternatingcurrent第3题Inengineeringtechnology,inductivesensorsarecommonlyusedformeasuring().AvoltageBmagneticfielddegreeCdisplacementDspeed第4题Theworkingprincipleofeddycurrentsensorsisbasedon().AthermalresistanceeffectBHalleffectCphotoelectriceffectDelectromagneticeffect第5题TheoutputoftheMoirefringegratingsensoris().AdigitalpulsetypeBamplitudemodulationtypeCFMtypeDsinewave第6题Eddycurrentsensorscanbedividedinto().AhighfrequencytransmissiontypeandlowfrequencyreflectiontypeBhighfrequencyreflectiontypeandlowfrequencytransmissiontypeCHighfrequencystraintypeandhigh-frequencytransmissiontypeDlowfrequencytransmissiontpyeandhigh-frequencyreflectiontype第7题Gratingcanbedividedinto().AlonggratingBshortgratingCflatgratingDarcgrating第8题Sensorsmadebasedonthe()arecallededdycurrentsensors.AeddycurrentBeddyCeddycurrenteffectDeddyeffect第9题Inagratingsensor,whichcomponentdoesconvertsopticalsignalsintoelectricalsignals?（）ArulergratingBindicatorgratingClightsourceDoptoelectroniccomponent第10题Whichtypeofgratingsensorisusedtomeasureangleorspeed?（）AlineargratingsensorBrotatinggratingsensorCspecialpurposegratingsensorDintelligentgratingsensor第11题Howdoestheinductanceofthecoilchangewhentheairgapbetweentheironcoreandthearmaturedecreasesinaself-sensingsensor?（）AunchangedBreduceCincreaseDunabletodetermine第12题Whataretheoutputcharacteristicsofdifferentialtransformerdisplacementsensors?（）ADCvoltageBACvoltage,ithasalinearrelationshipwithdisplacementCdirectcurrentDpulsesignal第13题Whattypeofmeasurementiscommonlyusedforeddycurrentdisplacementsensors?（）AcontactdisplacementmeasurementBnon-contactdisplacementmeasurementCcontactpressuremeasurementDnon-contacttemperaturemeasurement第14题Whichtypeofsensoriscommonlyusedforstablecontrolofyarntensionintextilemachinery?（）AresistancestrainsensorBgratingsensorCself-sensingsensorDeddyCurrentTransducer第15题WhatarethecharacteristicsofMoirefringe?（）AnonperiodicBlowsensitivityCperiodicDinstability第16题Forthefollowingsensors,whichdoesnotbelongtoworkbasedontheprincipleofelectromagneticinduction?（）AselfsensingdisplacementsensorBeddycurrentdisplacementsensorCsesistancestraintypesensorDtransformertypedisplacementsensor第17题Forthefollowingsteps,whichisthemostcriticalstepwheninstallingagratingsensor?（）AchoosingtheappropriateinstallationlocationBconnectingpowersupplyCdebuggingandmeasuringcircuitDaligningandcalibratinggratingruler第18题Therearemanytypesofinductivesensors,whichcanbedividedintothreetypesbasedontheirstructures:(),(),and().Aself-sensingsensorBdifferentialtransformertypeCeddycurrenttypeDpotentiometertype正确答案：ABC第19题Whatarethethreestructuralformsofself-sensingsensors?AariableairgapinductivesensorBvariableareainductivesensorCspiraltubetypeinductivesensorDreluctancetypeinductivesensor正确答案：ABC第20题Whatarethemeasurementcircuitsofself-sensingsensors?AACbridgeBtransformertypeACbridgeCresonanttypeamplitudemodulationDresonanttypefrequencymodulation正确答案：ABCD第21题Thedifferentialtransformertypesensormostlyadopts()and()circuits.AfullbridgerectificationBdifferentialrectificationChalfbridgerectifierDphasesensitivedetection正确答案：BD第22题Inductivesensorscanmeasurephysicalquantities,suchas().AdisplacementBvibrationCpressureDflowEproportion正确答案：ABCDE第23题Thereasonforgeneratingzeroresidualvoltageis().AtheelectricalparametersofthetwosecondarywindingsofthesensoraredifferentBthegeometricdimensionsofthetwosecondarywindingsofthesensorareasymmetricCnonlinearofmagnetizationcurveofmagneticmaterialsDincreaseofambienttemperature正确答案：ABC第24题Eddycurrentsensorsaremainlydividedintotwocategories:()and().Ahigh-frequencyreflectiontypeBhighfrequencytransmissiontypeClowfrequencyreflectiontypeDlowfrequencytransmissiontype正确答案：AD第25题Besidemeasuringdisplacement,whichthenon-electricquantitycanbemeasurededdycurrentsensors?AthicknessBsurfacetemperatureCspeedDstress正确答案：ABCD第26题Comparedtootherdisplacementsensors，whatarethemainadvantagesofeddycurrenttypesensorinmeasuringdisplacement？Aitcanachievenon-contactmeasurementBsimplestructureCitisnotafraidofpollutionfromoilandothermediaDcanmeasurelargedisplacements正确答案：ABC第27题Gratingsensorsaremainlycomposedof(),(),(),andphotoelectricreceivingcomponents,etc.AlightsourceBlensCgratingpairDindicatorgrating正确答案：ABC第28题WhatarethecharacteristicsofMoirefringe?AdirectionalBsynchronicityCmagnificationDadjustable正确答案：ABCD第29题Whatarethecharacteristicsofgratingsensors?Ahighprecision,largerangeBfastresponse,suitablefordynamicmeasurementCIncrementaltypeDhighrequirementsandhighcosts正确答案：ABCD第30题ThewidthandspacingofMoirefringehasnorelationshipwithtwolinesortherelativepositionandangleoftwoobjects.第31题Gratingsensorscanonlybeusedformeasuringlineardisplacementandcannotbeusedformeasuringrotationalangles.第32题Selfsensingdisplacementsensorsmustbeindirectcontactwiththeobjectbeingmeasuredwhenmeasuringdisplacement.第33题Thesensitivityofdifferentialtransformersensorsislowerthanthatofself-sensingsensors.第34题Thephotoelectriccomponentsofgratingsensorsaremainlyresponsibleforconvertingopticalsignalsintoelectricalsignals.第35题Theworkingprincipleofeddycurrentdisplacementsensorsissimilartothatofheatingprincipleofinductioncooker,bothbasedontheeddycurrenteffect.第36题Inautomatedassemblysystems,displacementsensorsareusuallyusedtodetectthesizeofpartsratherthanassemblyaccuracy.第37题Embedtheinductiveproximityswitchintotheconveyorbelt,andtheinductiveproximityswitchcanworknormally.第38题Thetwooutputsoftheproximityswitch(normallyopenandnormallyclosed)canbeturnedonoroffsimultaneously.第39题Highspeedmovingmetalobjectscanbedetectedbyusinginductiveproximityswitcheswithslowresponsetimeandshortmovementdistance.第40题Inductiveproximityswitchescanbeusedfordetectingnon-metallicmaterials.第41题Accordingtotheworkingprincipleofinductiveproximityswitches,theproblemofmetalandnon-metalmixedmaterialscannotbedetectedbyinductiveproximityswitches.第42题Therearetwotypesofmetrologicalgratingsaccordingtotheirapplicationscope:transmissiongratingsandreflectiongratings.第43题Forthemetrologicalgrating,theyarelonggratingformeasuringlinedisplacementandcirculargratingsformeasuringangulardisplacementaccordingtotheirdifferentpurposes.第44题AsinglephotoelectriccomponentreceivingaMoirFringesignalfromafixedpointcanonlydistinguishchangesinbrightnessandcannotdistinguishthedirectionofmovementofMoirFringe.Therefore,itcannotdistinguishthedirectionofmotionofmovingparts,andcannotaccuratelymeasuredisplacement.第45题Subdivisiontechniquescanbedividedintodirectsubdivisionmethodandresistancebridgesubdivisionmethod.第46题TheintensityvariationofMoirFringeisapproximatelysinusoidal,whichadoptsfurthersubdivisionofelectricalsignalsbyusing"frequencydoublingtechniques".Thiscanimprovemeasurementaccuracyoruseofcoarsergratings.第47题Thewirelessdoorandwindowmagneticsensorconsistsoftwoparts:awirelesstransmissionmodule(mainbody)andamagnetblock(magnet).Generally,themainbodyisinstalledonafixeddoorframe,andthemagnetisinstalledonamovabledoor.（）Chaptertest第1题WhydoHallcomponentstypicallyuseN-typesemiconductormaterialsinsteadofusingconductororinsulatormaterials?Aalthoughtheμoftheconductormaterialislarge,theρisverysmallBAlthoughtheρofinsulatingmaterialsislarge,theμisverysmalCinN-typesemiconductormaterials,themobilityofelectronsishigherthanthatofholes,andμn>μpDIheHallconstantofsemiconductormaterialsislargerthanthatofmetals第2题Atpresent,forthese